Evaluación de mecanismos de reactivación en celdas de combustible microbianas para la producción de bioelectricidad.

Abstract

Reactivation mechanisms were evaluated in Microbial Fuel Cells (CCMs) for the production of bioelectricity. Were set up two CCMs in acrilyc boxes with 125 mL capacity, the anode behavior was fed with soil from an inactive microbial fuel cell from the titration work (Armas & Ramirez, 2014, pp. 1- 105), the other implements were placed and the cathode electrode was placed to form the CCM circuit. Two substrate mechanisms (glucose) were tested in the four CCMs and two of them under direct electrical stimulation, during seven periods, with rest intervals between each period, the stimuli were applied with pulses of 2 thousand seconds, for voltages of: 0.3 V; 0.6 V; 0.9 V, each stimulus was repeated twice and finally by a single time 2 V, on the same cells. To monitor the generated voltage (V) sensors were installed to each CCM connected to a data acquisition system, during 43 days of monitoring. Additionally a control cell was conditioned which was fed only with distilled water monitored with the multimeter. At the end of the experiments, the average voltage generation of each test period was compared, an average generation of 0.13 V was obtained in cells fed only glucose for period VI (second stimulus of 0.9 V), but It is also observed that as the current pulses increase the cells under this mechanism react more and more in the generation of bioenergy. The microbiological analysis determined growth in 5 orders of magnitude at the end of the treatments. To complement these results it is recommended to experiment with higher voltages with the aim of analyzing the reaction of CCMs and the generation of bioelectricity.